Komatsu SK09J-2(S/N SK09JF20001-Up)
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu SK09J-2 is a wheeled skid steer loader manufactured from 1999 to 2003. It is powered by a 4D98E-1FD engine producing 69.8 hp gross power with a 202.5 cu in displacement. The machine has an operating weight of 3.4 tons (3,400 kg) and a rated operating capacity of 870 kg. It features a 0.45 m³ bucket capacity and a 13.3 gal hydraulic system fluid capacity. The SK09J-2 succeeded the SK09J series (1997-1999) and was succeeded by the SK818-5 and SK1020-5 Turbo models. Configurations offered include standard joystick controls and various attachment packages for material handling, road work, and demolition.
The SK09J-2 introduced a new-generation Komatsu engine designed for high power, low fuel consumption, and reduced emissions compared to its predecessor. It features a sophisticated sensor system that disables machine movement if incorrect operations are detected, enhancing safety in restricted spaces. The machine remains relevant in the used market due to its compact size, excellent visibility, and ease of maintenance access.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Komatsu SK09J-2(S/N SK09JF20001-Up) specifications
Engine
| Model | 4D98E-1FD |
| Number of Cylinders | 4 |
| Displacement | 202.5 cu in (3,318 cm³) |
| Gross Power | 69.8 hp (52.1 kW) @ 2,300 rpm |
| Net Power | 67.1 hp (50 kW) @ 2,300 rpm |
Weights
| Operating Weight | 7,495.8 lb (3,400 kg) |
| Rated Operating Capacity | 1,918.1 lb (870 kg) |
Dimensions
| Transport Length (with bucket) | 11.09 ft (3.38 m) |
| Transport Width (over tires) | 5.66 ft (1.75 m) |
| Transport Height (to top of cab) | 7.38 ft (2.25 m) |
| Wheelbase | 3.28 ft (1.00 m) |
| Ground Clearance | 9.45 in (240 mm) |
| Clearance at Max Lift and Dump | 7.88 ft (2.40 m) |
| Reach at Max Lift and Dump | 25.79 in (655 mm) |
| Turning Radius (from center, machine rear) | 63.39 in (1,610 mm) |
| Turning Radius (from center, inc bucket) | 80.79 in (2,050 mm) |
| Tipping Angle | 3,836.1 degrees |
Performance
| Max Travel Speed | 8.1 mph (13 km/h) |
| Operating Speed | 5 mph (8 km/h) |
| Breakout Force | 5,401.4 lb (2,400 kgf) |
| Bucket Capacity | 0.1 cu yd (0.45 m³) |
Service capacities (summary)
| Fuel Tank | 21.2 gal (80 L) |
| Hydraulic System | 13.3 gal (50 L) |
| Engine Oil | 2.4 gal (9 L) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu SK09J-2(S/N SK09JF20001-Up) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the SK09J-2(S/N SK09JF20001-Up) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize KOWA fluid analysis at every 500-hour interval to monitor engine wear metals and hydraulic contamination. Check the air filter restriction indicator daily and clean the outer element at 250 hours. Monitor the coolant SCA concentration at 500 hours to prevent liner cavitation. Inspect the hydraulic return filter at 500 hours to protect sensitive valve components. Verify the DEF level regularly on Tier 4 compliant units to ensure proper emissions system function. Track KOMTRAX telematics data for load frequency and fault codes to anticipate component stress before failure occurs.
Corrective & Common Repairs
Address hydraulic hose leaks immediately, as high-pressure lines are prone to abrasion against the frame. Replace the fuel filter and drain the water separator at 500 hours to prevent injector damage. Inspect the 4D98E-1FD engine belts and clamps at 250 hours for cracking or looseness. Check the articulation and steering pins for play and grease them frequently to prevent chassis binding. Inspect the tire condition and inflation pressure daily to ensure stable handling and prevent premature wear on the axle seals. Replace worn bucket teeth and cutting edges to maintain the 5,401.4 lb breakout force efficiency.
Overhaul & Rebuild Points
Perform a comprehensive component evaluation at 2,000 hours, including a hydraulic oil change and transmission service. Change the final drive oil at 1,000 hours and inspect the turbocharger for wear. At 2,000 hours, change the axle oil and differential oil to prevent gear wear. Inspect the structural frame and welds for fatigue cracks during the 1,000-hour structural inspection. Evaluate the battery health and alternator output at 500 hours to ensure reliable starting. Measure wear on the Z-bar linkage and pivot points to determine if bushing replacement is required to restore geometry.
Seasonal & Environment Servicing
Clear debris from the radiator and oil cooler fins daily to prevent overheating in dusty or hot environments. Check the coolant level and cap security before every shift to maintain thermal regulation. In cold weather, ensure the DEF system is protected and the fuel water separator is drained frequently to prevent gelling. Inspect the hydraulic hoses for brittleness in extreme cold and replace if necessary. Verify the battery charge state in low temperatures to ensure reliable starts. Adjust tire pressure according to terrain conditions to optimize traction and reduce ground pressure on soft surfaces.
SK09J-2(S/N SK09JF20001-Up) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| YM102103-55520 | O-Ring,(For Fuel Filter) | Fuel system service | Check fitment → |
| YM129470-55610 | Body, Fuel Filter | Fuel system service | Check fitment → |
| 848001079 | Air Filter, Assembly | Air intake service | Check fitment → |
| 885141126 | Glass, Transmission Oil Filter Clogging | Lubrication service | Check fitment → |
| YM121850-55710 | Element | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
SK09J-2(S/N SK09JF20001-Up) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E10 | Engine controller power failure | ECM power connections, fuses, or ground wires are faulty | Inspect ECM power connections, fuses, or ground wires |
| CA115 | Engine crankshaft speed sensor failure | Broken sensor, wiring issue, or connector corrosion | Replace the speed sensor, and verify the voltage at the pin connector |
| CA441 | Battery voltage too low | Alternator or battery failure; voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| CA442 | Battery voltage too high | Alternator or battery failure; voltage regulator issue | Replace the alternator or battery; check the voltage regulator |
| AA10NX | Air cleaner clogging | Dirty or blocked air filter element | Replace the air filter |
| B@BCNS | Engine coolant overheating | Radiator fins blocked, fan belt failure, or low coolant level | Check radiator fins, fan belt, and coolant level |
| B@HANS | Hydraulic oil overheating | Dirty hydraulic filter, low oil level, or cooler fan failure | Change hydraulic filter and oil; check cooler fan |
| AB00KE | Charge voltage low | Alternator failure or loose belt | Replace the alternator or tighten the belt |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
SK09J-2(S/N SK09JF20001-Up) attachments & work tools
Standard Buckets
The Komatsu SK09J-2 is equipped with a standard bucket having a capacity of 0.45 m³ (0.59 yd³). The machine has a rated operating capacity of 870 kg (1918 lb) and an operating weight of 3.4 t (7496 lb). The breakout force is 5401.4 lb (24.0 kN). Bucket sizes vary by configuration/series.
Coupler Systems
The machine utilizes a standard skid steer quick-attach coupler system for tool interchange. Factory specifications for the SK09J-2 do not list specific aftermarket coupler part numbers, but the frame is designed for standard industry-compatible mounting interfaces.
Hydraulic Kits & Auxiliaries
An auxiliary hydraulic kit is available for the SK09J-2, including a control pedal for superflow operation. The hydraulic system fluid capacity is 13.3 gal (50.4 L). Specific hydraulic kit configurations vary by machine serial number and dealer options.
Engine & Fluids
The SK09J-2 uses a 4D98E-1FD engine with 69.8 hp (50 kW) gross power. Komatsu recommends Komatsu Genuine Lubricants, including specific diesel engine oil, hydraulic oil, and super-coolant AF-NAC for optimal performance and component life.
All SK09J-2(S/N SK09JF20001-Up) assemblies by section
Every catalogued assembly group for the Komatsu SK09J-2(S/N SK09JF20001-Up). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Control System
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Control System : Auxiliary Hydraulic Kit Control Pedal
| 20***00 | Pedal | 2 |
| 33***64 | Handle | 1 |
| 33***12 | Yoke | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Control System : Auxiliary Hydraulic Kit Control Pedal (Superflow)
| 20***00 | Pedal | 2 |
| 33***64 | Handle | 1 |
| 33***12 | Yoke | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Control System : Fuel Control Lever
| 20***00 | Pedal | 1 |
| 33***78 | Support | 1 |
| 33***64 | Plate | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Control System : L.H. Servocontrol
| 33***79 | Tee | 2 |
| 33***81 | Elbow | 2 |
| 39***62 | Hose | 4 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Control System : R.H. Servocontrol
| 39***89 | Hose | 2 |
| 39***90 | Hose | 2 |
| 3K***00 | Protection | 2 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Control System : Safety Bars
| 33***28 | Bushing | 2 |
| 33***66 | Plate R.H | 1 |
| 33***67 | Plate L.H | 1 |
Engine
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Air Intake Manifold
| YM***02 | Screw | 2 |
| YM***00 | Manifold,Air Intake | 1 |
| YM***21 | Gasket (Kit) | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Camshaft And Driving Gear
| YM***00 | Idle Gear Ass'Y | 1 |
| YM***00 | Tappet Rod | 8 |
| YM***00 | Gear Ass'Y,Hydraulic Pump | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Cooling Water System
| YM***50 | V-Belt | 1 |
| YM***90 | Valve,Water Drain | 1 |
| YM***02 | Screw | 3 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Crankshaft And Piston
| YM***50 | Ring Set (+0.25 mm) | 4 |
| YM***00 | Crankshaft, Assembly | 1 |
| YM***80 | Flywheel, Assembly | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Cylinder Block
| YM***60 | Cylinder Block, Assembly | 1 |
| YM***00 | Screw | 18 |
| YM***00 | Main Metal Ass'Y (Std) | 5 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Cylinder Head
| 87***29 | Motor, Assembly | 1 |
| YM***80 | Retainer, Spring | 8 |
| YM***40 | Seal,Valve? Exhaust (Kit) | 4 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Electrical System
| YM***41 | Cover, Rear | 1 |
| YM***50 | Cable | 1 |
| YM***80 | Pulley | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Engine Stop Device
| YM***00 | Pin, Cotter | 1 |
| YM***02 | Nut | 1 |
| YM***11 | Coil, Assembly | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Exhaust Manifold
| YM***02 | Nut | 2 |
| YM***01 | Gasket (Kit) | 1 |
| YM***52 | Screw | 6 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Feed Pump
| YM***40 | Gasket | 4 |
| YM***60 | O-Ring | 2 |
| YM***00 | Screw | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Flywheel - Lubricating Oil Sump
| YM***52 | Screw | 9 |
| YM***10 | Oil Sump | 1 |
| YM***20 | Housing, Flywheel | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Fuel Injection Line
| YM***02 | Bolt Plated | 1 |
| YM***50 | Nozzle | 4 |
| YM***40 | Injection Pipe N. 4 | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Fuel Injection Pump
| YM***00 | Segment | 4 |
| YM***00 | Gasket Disc | 4 |
| YM***20 | Valve,Delivery | 4 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Fuel Piping
| YM***02 | Screw | 1 |
| YM***10 | Protector | 1 |
| YM***80 | Screw | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Gasket Set
| YM***40 | Seal,Valve? Exhaust (Kit) | 1 |
| YM***00 | O-Ring (Kit) | 1 |
| YM***01 | Gasket (Kit) | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Gear Housing
| YM***02 | Bolt Plated | 3 |
| YM***51 | Cap, Lub. Oil Supply | 1 |
| YM***02 | Screw | 10 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Governor
| YM***40 | Screw | 2 |
| YM***00 | Nut | 1 |
| YM***00 | Screw | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Lubricating Oil System
| YM***40 | Stud | 1 |
| YM***81 | Retainer | 1 |
| YM***00 | O-Ring (Kit) | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine : Starter Motor
| YM***80 | Holder Brush, Assembly | 1 |
| YM***10 | Retainer | 1 |
| YM***20 | Shift Lever Ass'Y | 1 |
Engine Related Parts And Electrical System
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Air Cleaner And Mounting
| 33***74 | Support | 1 |
| 33***80 | Pipe | 1 |
| 33***48 | Terminal | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Battery
| 30***14 | Retainer | 1 |
| 33***52 | Support | 1 |
| 50***07 | Rubber | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Dashboard
| 33***12 | Dashboard | 1 |
| 3F***05 | Plate, Ignition Panel | 1 |
| 80***60 | Screw | 4 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Electrical System (1/3)
| 80***86 | Washer | 1 |
| 80***01 | Spring Washer (With Stabilizers Only) | 1 |
| 80***34 | Collar | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Electrical System (2/3)
| 33***60 | Wiring Harness | 1 |
| 33***05 | Protection | 1 |
| 80***41 | Bolt | 4 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Electrical System (3/3)
| 80***66 | Bolt | 2 |
| 80***86 | Washer | 1 |
| 80***00 | Washer (For Homologation Road) | 2 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Engine Mounting Parts
| 33***75 | Support, Front, L.H | 1 |
| 33***76 | Support, Front, R.H | 1 |
| 33***58 | Support, Rear, L.H | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Fuel Piping
| 33***70 | Hose | 1 |
| 3F***04 | Protection | 1 |
| 3F***05 | Protection | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Fuel Tank
| 20***57 | Plug, Assembly | 1 |
| 31***58 | Cover | 1 |
| 33***52 | Float | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Muffler And Piping
| 33***56 | Pipe, Upper | 1 |
| 33***77 | Pipe, Upper | 1 |
| 33***78 | Muffler | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Power Take Off
| 33***16 | Washer | 2 |
| 33***53 | Support | 1 |
| 33***81 | Cover | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Radiator (1/2)
| 20***87 | Support, Tank | 1 |
| 33***85 | Protection | 1 |
| 33***64 | Sleeve | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Engine Related Parts And Electrical System : Radiator (2/2)
Frame
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Frame : Frame
| 20***20 | Plug | 2 |
| 20***80 | Ballast | 2 |
| 33***68 | Shim | 2 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Frame : Hydraulic Piping (Parking Brake Line)
| 33***81 | Cock, Assembly | 1 |
| 33***11 | Union | 1 |
| 39***21 | Hose | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Frame : Hydraulic Piping (Parking Brake Line) (For Road Circulation)
| 33***81 | Cock, Assembly | 1 |
| 33***00 | Block | 1 |
| 33***11 | Union | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Frame : Transmission
| 20***90 | Crown Wheel | 2 |
| 33***07 | Washer | 2 |
| 33***09 | Link | 2 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Frame : Wheels
| 11***77 | Wheel, Assembly | 1 |
| 11***79 | Wheel, Assembly | 4 |
| 33***11 | Column | 12 |
Guard And Operator'S Cab
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Guard And Operator'S Cab : Cabin (1/2)
| 33***10 | Gasket, R.H | 1 |
| 33***11 | Gasket, L.H | 1 |
| 33***61 | Protection | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Guard And Operator'S Cab : Cabin (2/2)
| 33***27 | Spacer (For Mounting Safety Valves) | 1 |
| 33***79 | Retainer | 1 |
| 33***53 | Box | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Guard And Operator'S Cab : Engine Hood
| 33***52 | Support | 1 |
| 33***53 | Striker | 1 |
| 33***02 | Spring | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Guard And Operator'S Cab : Front Door
| 33***53 | Wiper, Assembly | 1 |
| 33***54 | Door, Assembly | 1 |
| 33***55 | Bracket | 2 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Guard And Operator'S Cab : Heating System
| 33***16 | Diffuser | 1 |
| 33***50 | Support | 1 |
| 33***51 | Support | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Guard And Operator'S Cab : Inner Cabin Cover
| 33***45 | Sheet | 1 |
| 33***02 | Cover | 1 |
| 33***16 | Sheet | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Guard And Operator'S Cab : Operator'S Cab (Equipment) (Only For Germany)
| 80***04 | Nut | 6 |
| 80***08 | Washer (Optional) | 4 |
| 80***09 | Washer | 2 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Guard And Operator'S Cab : Operator'S Seat
| 33***63 | Seat Belt, Assembly | 1 |
| 33***68 | Washer | 4 |
| 33***22 | Plate (Except Germany) | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Guard And Operator'S Cab : Operator'S Seat (Optional)
| 33***63 | Seat Belt, Assembly | 1 |
| 33***68 | Washer | 4 |
| 80***88 | Bolt (With Stabilizers Only) | 4 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Guard And Operator'S Cab : Ppc Valves Support
| 33***70 | Guide, R.H | 1 |
| 33***71 | Guide, L.H | 1 |
| 33***74 | Support, L.H | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Guard And Operator'S Cab : Rear Hood
| 33***54 | Hinge | 2 |
| 33***13 | Pin | 2 |
| 33***67 | Pushrod | 1 |
Mark Plate
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Mark Plate : Equipment (For Road Circulation)
| 20***24 | Chain (With Stabilizers Only) | 2 |
| 33***23 | Plate, L.H | 1 |
| 33***24 | Plate, R.H | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Mark Plate : Equipment (For Road Circulation) (Cold Planner Version)
| 33***50 | Spacer | 2 |
| 33***51 | Pin | 2 |
| 50***92 | Stopper | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Mark Plate : Equipment (For Road Circulation) (Germany Version)
| 20***24 | Chain (With Stabilizers Only) | 2 |
| 33***23 | Plate, L.H | 1 |
| 33***24 | Plate, R.H | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Mark Plate : Equipment (Germany Version)
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Mark Plate : Tools
| 33***35 | Support | 1 |
| 33***53 | V-Belt | 1 |
| 33***54 | Tools Bag | 1 |
Work Equipment
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment : Arm
| 33***53 | V-Belt | 1 |
| 33***50 | Arm | 1 |
| 33***51 | Safety Bar | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment : Bucket
| 20***42 | Handle | 1 |
| 33***06 | Spacer | 6 |
| 33***18 | Link | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment : Bucket Tipping Cylinder (L.H.)
| 39***49 | Bushing | 1 |
| 39***52 | Bushing | 1 |
| 39***13 | Dump Cylinder, L.H | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment : Bucket Tipping Cylinder (R.H.)
| 39***49 | Bushing | 1 |
| 39***52 | Bushing | 1 |
| 39***14 | Dump Cylinder, R.H | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment : Lifting Cylinder : Unit_02_of_02
| 39***30 | Bushing | 1 |
| 39***52 | Bushing | 1 |
| 39***09 | Lift Cylinder, L.H | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment : Lifting Cylinder : Unit_01_of_02
| 39***30 | Bushing | 1 |
| 39***52 | Bushing | 1 |
| 39***08 | Lift Cylinder, R.H | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment : Stabilizer Foot
| 33***51 | L.H. Stabilizator Foot | 1 |
| 33***52 | R.H. Stabilizator Foot | 1 |
| 33***55 | L.H. Cylinder, Assembly | 1 |
Work Equipment Control System
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Bucket Lifting Hydraulic System (Floating Version)
| 33***02 | Block | 1 |
| 39***98 | Hose | 1 |
| 39***72 | Hose | 2 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Cold Plenner Return Kit
| 20***53 | Body (For Hand Hammer) | 1 |
| 20***62 | Plug (For Hand Hammer) | 1 |
| 20***06 | Clamp (For Hand Hammer) | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Control Valve (1/2) : Unit_02_of_02
| 80***77 | Screw | 8 |
| 84***50 | Element, Assembly | 1 |
| 84***52 | Element, Assembly | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Control Valve (1/2) : Unit_01_of_02
| 80***77 | Screw | 4 |
| 84***69 | Tie-Rod, Assembly | 4 |
| 84***70 | Kit, Gasket (Control Valve, Assembly.) | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Control Valve (For Outrigger)
| 80***77 | Screw | 4 |
| 84***50 | Element, Assembly | 2 |
| 84***67 | Tie-Rod, Assembly | 4 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Final Drive (1/2)
| 80***49 | Screw | 2 |
| 84***12 | Hydraulic Motor | 1 |
| 84***73 | Spring | 11 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Final Drive (2/2)
| 80***74 | Screw | 2 |
| 84***09 | Plug | 2 |
| 84***40 | Cap Valve | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping (Auxiliary Kit Line)
| 20***48 | Coupling, Assembly. (For Hammer On Plate And On Excavator) | 1 |
| 20***49 | Fitting (For Hammer On Plate And On Excavator) | 1 |
| 20***50 | Body (For Hammer On Plate And On Excavator) | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping (Bucket Lifting Cylinder)
| 20***70 | Clamp | 4 |
| 30***22 | Clamp | 2 |
| 33***55 | Pipe | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping (Bucket Tipping Cylinder)
| 33***15 | Retainer | 1 |
| 33***51 | Pipe | 1 |
| 33***52 | Pipe | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping (Cold Planner Kit)
| 20***40 | Union | 1 |
| 20***58 | Fitting | 1 |
| 20***61 | Plug | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping (Oil Cooler And Return Line)
| 20***49 | Union | 1 |
| 20***30 | Plug | 1 |
| 20***06 | Union | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping (Suction And Delivery Line)
| 20***90 | Pressure Take-Up | 1 |
| 33***84 | Union | 1 |
| 33***88 | Pipe | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping (Suction And Delivery Line) (Superflow)
| 33***03 | Plate | 1 |
| 39***60 | Hose | 2 |
| 39***30 | Hose | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping (Travel Line) (1/2)
| 33***81 | Pipe | 1 |
| 33***86 | Union | 2 |
| 39***67 | Hose | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping (Travel Line) (2/2)
| 33***67 | Pipe | 1 |
| 33***77 | Elbow | 4 |
| 33***78 | Union | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping (Travel Line) (2/2) (For Road Circulation)
| 33***67 | Pipe | 1 |
| 33***77 | Elbow | 4 |
| 33***78 | Union | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping L.H. (Servocontrol Line)
| 33***11 | Union | 1 |
| 39***42 | Hose | 1 |
| 39***63 | Hose | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping R.H. (Servocontrol Line)
| 39***92 | Hose | 1 |
| 39***65 | Hose | 1 |
| 50***44 | Union | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Piping R.H. (Servocontrol Line) (For Road Circulation)
| 33***53 | Link (For Homologation Road) | 1 |
| 39***92 | Hose | 1 |
| 39***65 | Hose | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Pump (1/2)
| 84***10 | Pump, Assembly | 1 |
| 84***30 | Pump, Assembly | 1 |
| 84***57 | Pin | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Pump (2/2)
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Hydraulic Tank
| 20***90 | Plug | 1 |
| 20***40 | Indicator Oil Level | 1 |
| 33***54 | Hydraulic Tank | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Outrigger Control Lever (1/2)
| 33***12 | Union | 1 |
| 39***57 | Hose | 2 |
| 39***65 | Hose | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Outrigger Control Lever (2/2)
| 33***50 | Pipe | 2 |
| 33***52 | Pipe | 1 |
| 33***53 | Pipe | 1 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Ppc Valve, L.H.
| 84***57 | Ppc Valve, L.H., Assembly | 1 |
| 84***52 | Washer | 8 |
| 84***56 | Shim, 0.100 mm | 0 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Ppc Valve, R.H.
| 84***52 | Washer | 8 |
| 84***56 | Shim, 0.100 mm | 0 |
| 84***57 | Shim, 0.200 mm | 0 |
Komatsu : Sk09j-2(S/N Sk09jf20001-Up) : Work Equipment Control System : Self-Levelling Valve
| 84***25 | Valve | 1 |
| 84***26 | O-Ring | 2 |
| 84***27 | Plug | 2 |
SK09J-2(S/N SK09JF20001-Up) serial number reference
The PIN plate is riveted to the rear hydraulic column on the right side of the machine (as seen from the direction of travel). Read the first four characters of the serial number on the plate to identify the prefix (e.g., SK09JF).
| Prefix | Identifies | Notes |
|---|---|---|
| SK09JF | SK09J-2 | Serial range SK09JF20001-Up. Identified as the SK09J-2 generation skid steer loader. Production years 1999–2003. Engine: 4D98E-1FD (69.8 hp gross). |
Frequently asked questions
What engine does the Komatsu SK09J-2 use?
The Komatsu SK09J-2 is equipped with a 4D98E-1FD engine producing 69.8 hp gross power with a 202.5 cu in displacement.
What is the operating weight of the Komatsu SK09J-2?
The operating weight is 3.4 tons (3,400 kg), varying slightly by configuration and attachment package.
What model replaced the Komatsu SK09J-2?
The SK09J-2 was succeeded by the SK818-5 and SK1020-5 Turbo models in Komatsu's wheeled skid steer lineup.
What SK09J-2(S/N SK09JF20001-Up) owners discuss
What engine powers the Komatsu SK09J-2 (S/N SK09JF20001-Up) and what are its key specifications?
What are the common hydraulic behaviors and issues reported for the Komatsu SK09J-2?
What undercarriage and wear patterns are typical for the Komatsu SK09J-2 skid steer?
What engine quirks or maintenance items are specific to the 4D98E-1FD series in this machine?
What are the common electrical or sensor issues for the Komatsu SK09J-2?
What should be checked when buying a used Komatsu SK09J-2 (S/N SK09JF20001-Up)?
What are the recommended fluid specifications for the Komatsu SK09J-2?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific SK09J-2(S/N SK09JF20001-Up) part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.